Speakers
Description
Optically Stimulated Luminescence (OSL)-based dosimetry has emerged as a promising technique for radiation monitoring in medical, environmental, and occupational applications. In this study, the OSL properties of lithium magnesium phosphate materials doped with titanium (LiMgPO₄:Ti) were investigated with the aim of optimizing sensitivity and dose-response linearity.Pure LiMgPO₄ and samples doped with different Ti concentrations (0.25, 0.5, and 0.66 mol%) were irradiated using a Sr-40 source with doses ranging from 63 to 626 mGy and subsequently analyzed by OSL readout. Titanium doping significantly enhanced the OSL response compared to the undoped material, and a non-linear dependence of luminescent response on Ti concentration was observed. The samples doped with 0.25 and 0.5 mol% Ti exhibited the highest intensities and demonstrated a linear dose-response behavior within the investigated dose range, indicating a regular and predictable response to radiation exposure. The LiMgPO₄:0.25% Ti sample presented the lowest minimum detectable dose, approximately 0.8 mGy, highlighting its capability to detect very low radiation levels. The luminescence decay curves revealed three main components with decay times of 1.83, 6.06, and 43.14 s for the 0.25 mol% Ti-doped sample, and 1.78, 6.55, and 40.18 s for the 0.5 mol% Ti-doped sample. Overall, the results indicate that the 0.25 mol% Ti concentration is the most suitable for producing highly sensitive OSL detectors with stable and reliable responses, showing strong potential for applications in radiation protection and radiation monitoring.